package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import com.sky.utils.WeChatPayUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.alibaba.fastjson.JSON; //这一行是自己加的（因为下面的json报错，file重新清除缓存：没解决问题）

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Slf4j
@Service
public class UserServiceImpl implements UserService {

    public static final String WX_LOGIN ="https://api.weixin.qq.com/sns/jscode2session";


    @Autowired
    private WeChatProperties weChatProperties;

    @Autowired
    private UserMapper userMapper;
    /**
     * 微信登录
     * @param userLoginDTO
     * @return
     */
    public User wxLogin(UserLoginDTO userLoginDTO) {
        //1.调用微信接口，获取用户openId
        String openid = getOpenId(userLoginDTO.getCode());

        //2.判断用户openId是否为空，为空表示登录失败，抛出业务异常
        if (openid==null){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }
        //3.判断当前用户是否为新用户

        User user = userMapper.getByOpenId(openid);//openId是用户唯一标识
        //4.若为新用户则自动完成注册
        if (user==null){
            user = User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())
                    .build();
            userMapper.insert(user);//后续UserController里面需要getUserId，所以需要使用配置文件里的得到id
        }
        log.info("........................................");
        //5.返回这个用户对象
        return user;

    }

    /**
     * 调用微信接口，获取用户openId
     * @param code
     * @return
     */
    private String getOpenId(String code) {
        Map<String, String> map =new HashMap<>();
            map.put("appid",weChatProperties.getAppid());
            map.put("secret",weChatProperties.getSecret());
            map.put("js_code",code);
            map.put("grant_type","authorization_code");
        String json = HttpClientUtil.doGet(WX_LOGIN,map);

        //解析openId为json格式
        JSONObject jsonObject = JSON.parseObject(json);
        String openid = jsonObject.getString("openid");
        return openid;
    }
}
